541 Million Years Ago
Through serious Radiations and while Phyla was first appearing.

263 Billion Years Ago
Through a Lack of oxygen in the Ozone layer.

At the end of the Jurassic Period about 319 Million Years Ago

540 Million Years Ago

Because Scientists like to name old stuff fancy names.

Because the Sea "Exploded" with magmaic gasses and acid air.

The Cambrian Period makes an important turnaround in what could have been full extinction (100%) of life on Earth

Because scientists couldn't officially agree on what it should be called, so instead of calling it the Cambrian Period, they called it the Cambrian Explosion.

The Cambrian Period marks an important point in the history of
life on Earth.

It is the time when most of the major groups of animals first appear in the fossil record.

It is called the Cambrian Explosion because of the limited short time when the diversity appears.

Because the sea basically "Exploded" with many ife forms with billions of animals.
AND
It is called the Cambrian Explosion because of the limited short time when the diversity appears.

Scientific remains of old fossils, shells, & slides.

The period of time before written records.

Scientific Geozone's and Ozones that helped to cause the Cambrian Radiation

Science

Uneducated Guesses

Scientism

Scientists

Earth Science